I microbenchmarked System.arraycopy() on a bunch of different processors, and to my surprise Core.i5/i7 processors give a throughput 5 or 6 times higher than a Core 2 Duo. It can't be the difference between DDR2 and DDR3 memory, so I'm wondering if the native code might use some instruction set not available on older processors. Any ideas?

I vary the array size from approx 500 bytes to 32MB. I can see changes that relate directly to the size of the caches (performance drops by a bit when the array is larger than the cache size), but the huge 5x factor applies across the range of array sizes.

java-gaming.org is not responsible for the content posted by its members, including references to external websites,
and other references that may or may not have a relation with our primarily
gaming and game production oriented community.
inquiries and complaints can be sent via email to the info‑account of the
company managing the website of java‑gaming.org